Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets- Intangible Assets (Details)

v3.7.0.1
Goodwill and Intangible Assets- Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Proceeds from sale of assets of a business $ 2,777 $ 0  
Goodwill, written off related to sale of business 2,639    
Gross Carrying Amount 25,384   $ 25,707
Accumulated Amortization 22,011   21,776
Intangible assets, net 3,373   3,931
Amortization of intangible assets 380 604  
Customer contracts      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 7,619   7,594
Accumulated Amortization 7,597   7,566
Amortization of intangible assets 7 46  
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 11,502   11,652
Accumulated Amortization 8,414   8,048
Non-compete agreements      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 3,000   3,203
Accumulated Amortization 2,961   3,158
Technology      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 2,721   2,716
Accumulated Amortization 2,520   2,485
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 542   542
Accumulated Amortization 519   $ 519
Customer Relationships, Noncompete Agreements, Technology and Trade Names      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 373 $ 558  
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 1 year    
Minimum | Customer contracts      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets useful life 1 year    
Minimum | Other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 4 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 15 years    
Maximum | Customer contracts      
Finite-Lived Intangible Assets [Line Items]      
Acquired intangible assets useful life 5 years    
Maximum | Other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life 15 years